EP0618367B1 - Seitenkanalpumpe - Google Patents

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Publication number
EP0618367B1
EP0618367B1 EP94104508A EP94104508A EP0618367B1 EP 0618367 B1 EP0618367 B1 EP 0618367B1 EP 94104508 A EP94104508 A EP 94104508A EP 94104508 A EP94104508 A EP 94104508A EP 0618367 B1 EP0618367 B1 EP 0618367B1
Authority
EP
European Patent Office
Prior art keywords
impeller
casing
pump
portions
groove means
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP94104508A
Other languages
English (en)
French (fr)
Other versions
EP0618367A1 (de
Inventor
Takahiko Kato
Motoya Ito
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Denso Corp
Original Assignee
Denso Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=13469583&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0618367(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Denso Corp filed Critical Denso Corp
Publication of EP0618367A1 publication Critical patent/EP0618367A1/de
Application granted granted Critical
Publication of EP0618367B1 publication Critical patent/EP0618367B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D5/00—Pumps with circumferential or transverse flow
    • F04D5/002—Regenerative pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/18—Rotors
    • F04D29/188—Rotors specially for regenerative pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00—Function
    • F05D2260/30—Retaining components in desired mutual position
    • F05D2260/35—Reducing friction between regenerative impeller discs and casing walls

Definitions

  • the present invention relates to an impeller of a Westco-type pump, which is suitable, for example, as an automobile fuel pump.
  • the "Westco-type pump” referred herein is also called a vortex pump, a regenerative pump or a periphery pump.
  • the Westco-type pump makes use of an impeller which is a disk formed on its entire periphery with a multitude of recesses. A pumping action is effected in a working passage surrounding a portion of the periphery of the impeller. One end of the working passage is communicated via an intake passage with a suction tube and the other end is communicated via a discharge passage with a discharge tube. There is a partition between the discharge passage and the intake passage. There is formed an extremely small radial space between an outer periphery of the impeller and an inner periphery of the partition, and an extremely small axial space (a side clearance) between a radial inward end surface portion of the impeller and a radial inward inner surface portion of a casing.
  • Japanese Unexamined Patent Publication No. 58-19745 discloses a recess provided in an inner surface of the casing for generating an axial force urging the impeller, thereby improving the pumping efficiency.
  • Japanese Unexamined Patent Publication No. 58-2495 discloses a spiral groove formed on an end surface of the impeller so as to reduce the thrust load acting on the impeller.
  • Japanese Unexamined Utility Model Publication No. 57-114195 discloses a number of spiral grooves formed on an end surface of the impeller and an inner surface of the casing.
  • Japanese Unexamined Patent Publication No. 60-85284 discloses a wedge-shaped layer formed between an inner wall of the housing and a sliding surface of the impeller, thereby reducing the wear of the impeller.
  • the impeller configurations according to these prior art disclosures are incapable of producing a sufficiently uniform fluid film in the side clearance formed between an end surface of the impeller and an inner surface of the housing and then hardly suppress the generation of the linking phenomenon.
  • the spiral grooves are formed on the end surface of the impeller, an unbalance of the fluid is positively created within the seal surface region so that the impeller tends to incline due to a slight pressure difference or the like.
  • a floating self-centering turbine impeller comprising a plurality of impeller vanes for facing an annular pumping chamber defined by a casing and end surfaces to be separated from seal surfaces of the casing by small axial spaces.
  • Document US-A-4 854 830 discloses a motor-driven fuel pump comprising an impeller the opposite sides of which are communicated with each other via through holes formed in the impeller, so as to eliminate a pressure difference between opposite sides, thereby preventing the impeller from being slanted.
  • a pump including a disk-like impeller on which a plurality of recesses or pockets are formed in concentric series.
  • the pockets are disposed in such a way that any radial line extends across at least one of such pockets. A leakage from a central portion towards a peripheral portion is reduced, since such leakage passes through the pockets.
  • An object of the present invention is to provide an impeller of Westco-type pump in which a substantially uniform fluid film is formed in the side clearance between an end surface of the impeller and an inner surface of the casing, thereby suppressing the generation of the linking phenomenon.
  • a first embodiment of the present invention which is applied to an automobile fuel feeding pump will be described in connection with Figs. 1 and 2.
  • the fuel feeding pump onto which a filter (not shown) is mounted is used to be disposed in a fuel tank.
  • the fuel pump 8 comprises a pump portion 10, a motor portion 12 and a discharge portion 14. Fuel introduced through an intake port 16 of the pump portion 10 passes through a motor chamber 18 of the motor portion 12 and is discharged out of the pump 8 through a discharge port 20 of the discharge portion 14.
  • the motor portion 12 includes a permanent magnet 24 and an armature 26 which are coaxially accommodated within a cylindrical pump case 22.
  • the permanent magnet 24 is secured to an inner wall of the pump case 22 and the armature 26 has a driving shaft 28 rotatably supported by means of bearings 30 and 32.
  • a brush (not shown) is slidably contacted to the armature 26 and is electrically connected to a terminal 36 secured to an end cover 34. This end cover 34 is provided with the discharge port 20 of the discharge portion 14.
  • the pump portion 10 includes a pump housing 44 secured to an opening portion 22a of the pump case 22.
  • the pump housing 44 has a pump cover 38 and a pump casing 40.
  • a disk-like space 46 formed between the inner wall surface 38a of the pump cover 38 and the inner wall surface 40a of the pump casing 40, there is disposed rotatably a disk-like impeller 42.
  • a peripheral portion of the space 46 is formed into a C-shaped pumping chamber 49 along the periphery of the impeller 42.
  • the impeller 42 is fitted to an end portion of the driving shaft 28 rotatably supported by the bearings 30 secured to the pump casing 40. Accordingly, the impeller 42 is axially movable.
  • the space 54 is defined between a seal surface formed at the inner wall surface 40a of the pump casing 40 and the end surface 42a of the impeller 42 whereas the space 55 is defined between a seal surface formed at the inner wall surface 38a of the pump cover 38 and the end surface 42a of the impeller 42.
  • the seal surfaces are formed in an annular configuration, respectively within an annular area having a radial dimension 1 as shown in Figs. 1 and 2.
  • the impeller 42 is provided at a part of periphery thereof with vanes 56 and recesses 58 which alternate with each other as shown in Fig. 1.
  • the impeller 42 is provided at a center portion thereof with an axial through hole 60 designed to be engaged with the driving shaft 28 and with pressure relief axial through holes 62, 63 and 64 for reducing the pressure difference between the both sides of the impeller 42.
  • each end surface 42a, 42b of the impeller 42 is provided with eight C-shaped grooves each having a U-shaped cross section, which are spaced equiangularly form one another and disposed point-symmetrically about a central of rotation of the impeller 42.
  • the C-shaped grooves 66 are oriented so that when the impeller 42 is rotated, the fuel in the U-shaped grooves tends to concentrate at the respective central portion of the C's.
  • the depth of the U-shaped cross section of the C-shaped groove is set to a specific value within a range of 0.01 mm to 0.1 mm. Further, in view of the fact that the end surfaces 42a and 42b become sliding surfaces, the flatness thereof is maintained at a level of 0.005 mm.
  • each space 54, 55 is maintained at a small value, e.g., 0.01 mm (0.02 mm for both) or less, which is smaller than that in the conventional Westco-type fuel pump. It is 0.01 mm to 0.02 mm (0.02 mm to 0.04 mm for both) in the conventional Westco-type fuel pump.
  • the C-shaped grooves 66 are disposed plane-symmetrically with respect to a central surface between the end surfaces 42a and 42b of the impeller 42. All the C-shaped grooves 66 are positioned on the areas of both end surfaces of the impeller 42 facing the corresponding seal surfaces of the pump cover 38 and the pump casing 40, respectively and then communicated with neither a space accommodating the driving shaft 28 nor the pumping chamber 49.
  • the central portions 663 of the C-shaped grooves 66 are arranged to substantially coincide with a radial center circle C (indicated by a one dot line in Fig. 1) of the seal surface.
  • the C-shaped grooves are moved at high speed relative to the inner wall 38a of the pump cover 38 and the inner wall 40a of the pump casing 40. Then, the fuel in the C-shaped grooves is, due to its viscosity, moved in the C-shaped grooves while being attracted to the inner wall 38a and the inner wall 40a, and when it collides against the downstream side walls 660, the velocity components in the axial direction of the impeller 42 towards the pump casing 40 are obtained to generate a force axially urging the pump cover 38 or the pump casing 40.
  • V-shaped grooves 72 are formed on each end surface 42a, 42b of an impeller 42.
  • the V-shaped grooves 72 are arranged in a manner such that when the impeller 42 is rotated, the fuel is moved towards angle portions of the V-shaped grooves 72. This is alike for the V-shaped grooves on both end surfaces 42a and 42b of the impeller 42.
  • a third embodiment is shown in Fig. 6, in which a plurality of pairs of linear grooves 84a and 84b are formed around a center of an impeller on both end surfaces 42a and 42b thereof.
  • Each pair of grooves 84a and 84b are so arranged that they may converge radially outwardly.
  • These grooves 84a and 84b are arranged alternately.
  • the grooves 84a extend to incline circumferentially outwardly with respect to the direction of rotation of the impeller 42 while the grooves 84b extend to incline circumferentially inwardly with respect to the direction of rotation of the impeller 42.
  • the two kinds of the grooves 84a and 84b inclined opposite directions with respect to the direction of rotation of the impeller 42 are formed on both end surfaces 42a and 42b of the impeller 42 to cause the fuel in the spaces 54 and 55 to flow towards the seal surfaces.
  • each C-shaped groove or V-shaped groove may be replaced by a pair of independent grooves arranged corresponding to both arm potions thereof. Further, it may be replaced with a W-shaped groove or the like.
  • the example 1 uses an impeller having no groove on either end surface thereof.
  • the example 2 uses an impeller having spiral grooves 80 formed on both end surfaces 42a and 42b of the impeller 42.
  • Japanese Unexamined Patent Publication No. 58-24955 and Japanese Unexamined Utility Model Publication No. 57-114195 show the impeller similar to the example 2.
  • the impeller having spiral grooves formed on either end surface thereof can be readily inclined due to slight pressure difference because a fluid unbalance is positively created.
  • the pumps using impeller according to the first and the second embodiments have relatively large discharge and less current consumption with respect to the discharge pressure, as compared with the pumps using impeller according to the examples 1 and 2.
  • the pumps using impeller according to the first and the second embodiments have higher pumping efficiencies with respect to the discharge pressure, as compared with the pumps using impeller according to the examples 1 and 2.
  • the reduction in the pumping efficiency is limited due to that the linking is prevented by the effect of the V-shaped grooves or the C-shaped grooves.
  • the example 2 with the spiral grooves causes the pumping efficiency to be reduced as the discharge pressure becomes higher. This is apparently due to that there develops the linking between the impeller and the pump casing or the pump cover to increase the sliding resistance.
  • the grooves are formed so as to be involuted unidirectionally, it is found that the fuel within the spaces 54 and 55 is concentrated at a single portion located eccentrically and then a uniform liquid film is hardly formed between the impeller 42 and the housing, making it liable for the impeller 42 to incline, hence occurring the linking phenomenon.
  • the C-shaped grooves or V-shaped grooves tend to concentrate the fuel substantially to the radial center circle C and to push it out.
  • a substantially uniform liquid film is maintained within the seal surface to limit the inclination of the impeller 42 while the impeller 42 is skimmed with certainty from the inner wall 38a of the pump cover 38 and the inner wall 40a of the pump casing 40, thus making it not liable that the linking phenomenon occurs.
  • the grooves formed on both end surfaces of an impeller cause fluid to flow towards seal surfaces with a substantially uniform fluid quantity distribution on the impeller. Accordingly, the liquid film is maintained with certainty between both ends of the impeller and the seal surfaces of the housing to reduce the generation of the linking phenomenon.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Claims (9)

  1. Flügelrad einer Pumpe der Westco-Art, um ein Fluid mit Druck zu beaufschlagen, wobei das Flügelrad folgende Einrichtungen aufweist:
    eine Vielzahl von Flügelradschaufeln (56), die beim Gebrauch einer ringförmigen Pumpenkammer (49) zugewandt sind, die durch eine Ummantelung definiert ist; und
    Endflächen (42a, 42b), die beim Gebrauch von Dichtflächen der Ummantelung durch kleine axiale Räume getrennt sind,
    Nuteneinrichtungen (66; 72; 84a, 84b), die an Abschnitten der Endflächen des Flügelrads vorgesehen sind, die beim Gebrauch den Dichtflächen der Ummantelung zugewandt sind, wobei die Nuteneinrichtungen so aufgebaut und angeordnet sind, daß sich das Fluid zwischen den Endflächen des Flügelrads und den Dichtflächen der Ummantelung an Kantenabschnitten der Nuteneinrichtungen konzentriert, so daß das Fluid zu den Dichtflächen fließt, wobei die Nuteneinrichtungen derart ausgebildet sind, daß das Fluid beim Gebrauch eine im wesentlichen gleichmäßige Fluiddruckverteilung bildet; wobei jede der Nuteneinrichtungen zwei Abschnitte hat, wobei jeder ein erstes Ende und ein zweites Ende hat, wobei das zweite Ende in der Umfangsrichtung von dem ersten Ende in der Drehrichtung des Flügelrads versetzt ist, wobei bei einem Abschnitt von jeder Nuteneinrichtung sein erstes Ende radial weiter von einer Mitte des Flügelrads versetzt ist als das zweite Ende, und bei dem anderen der beiden Abschnitte das zweite Ende radial weiter von der Mitte des Flügelrads versetzt ist als das erste Ende, wobei die beiden Abschnitte von jeder Nuteneinrichtung entweder an den ersten Enden verbunden sind, um eine einzelne Nut zu bilden, oder getrennt voneinander ausgebildet sind, wobei es keine Verbindung zwischen den Nuteneinrichtungen an den entgegengesetzten Endflächen durch das Flügelrad hindurch gibt.
  2. Flügelrad nach Anspruch 1, wobei die Nuten vollständig in den Endflächen (42a, 42b) enthalten sind, die den Dichtflächen zugewandt sind.
  3. Flügelrad nach Anspruch 1, wobei die beiden Abschnitte von jeder der Nuteneinrichtungen (72; 84a, 84b) geradlinig sind.
  4. Flügelrad nach Anspruch 3, wobei die ersten Enden der geradlinigen Ausläuferabschnitte (72) im wesentlichen auf einem Kreis (C) der Dichtfläche positioniert sind, wobei der Kreis die Mitte des Abstands zwischen der Mitte der Dichtfläche und deren Umfang definiert.
  5. Flügelrad nach Anspruch 4, wobei die geradlinigen Abschnitte an ihren ersten Enden miteinander verbunden sind, um eine einzelne V-förmige Nut (72) zu bilden, und wobei der Öffnungsabschnitt der V-förmigen Nut zu der Drehrichtung des Flügelrads offen ist.
  6. Flügelrad nach Anspruch 1, wobei die beiden Abschnitte von jeder Nuteneinrichtung miteinander verbunden sind, um eine einzelne C-förmige Nut (66) zu bilden, und wobei der Öffnungsabschnitt der C-förmigen Nut zu der Drehrichtung des Flügelrads offen ist.
  7. Pumpe der Westco-Art, um ein Fluid mit Druck zu beaufschlagen, mit:
    einer Ummantelung (38, 40) mit einer teilweise ringförmigen Pumpenkammer (49), die einen Ansauganschluß mit einem Abgabeanschluß verbindet, wobei die Ummantelung an ihren gegenüberliegenden Innenwandflächen vorgesehen ist, wobei Dichtflächen radial inwärts von der Pumpenkammer angeordnet sind; und
    einem Flügelrad (42) nach einem der Ansprüche 1 bis 6.
  8. Pumpe der Westco-Art nach Anspruch 7, wobei die Ummantelung an beiden Seiten des Flügelrads positioniert ist und wobei die Pumpenkammer (49) und die Dichtflächen gegenüber den beiden Seiten des Flügelrads sind.
  9. Kraftstoffpumpe zum Fördern von Kraftstoff zu einer Brennkraftmaschine mit:
    einem Motorabschnitt (12); und
    einem Pumpenabschnitt (10), der einstückig mit dem Motorabschnitt (10) montiert ist, wobei der Pumpenabschnitt ein Flügelrad, das durch den Motorabschnitt drehend angetrieben wird und an einer seiner Endflächen vorgesehen ist, mit einem Schaufelstrang, der durch eine Vielzahl von Schaufeln (56) und eine Vielzahl von Vertiefungen (58) gebildet ist, die abwechselnd zueinander angeordnet sind, und eine Ummantelung (40, 38) aufweist, die eine C-förmige Pumpenkammer (49) definiert, die dem Schaufelstrang zugewandt ist und Dichtflächen hat, die den Endflächen des Flügelrads durch einen kleinen axialen Raum zugewandt sind, wodurch der Kraftstoff in der Pumpenkammer begrenzt wird, wobei das Flügelrad ein Flügelrad nach einem der Ansprüche 1 bis 6 ist.
EP94104508A 1993-03-30 1994-03-22 Seitenkanalpumpe Expired - Lifetime EP0618367B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP07175293A JP3228446B2 (ja) 1993-03-30 1993-03-30 ウエスコポンプ
JP71752/93 1993-03-30

Publications (2)

Publication Number Publication Date
EP0618367A1 EP0618367A1 (de) 1994-10-05
EP0618367B1 true EP0618367B1 (de) 1997-12-03

Family

ID=13469583

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94104508A Expired - Lifetime EP0618367B1 (de) 1993-03-30 1994-03-22 Seitenkanalpumpe

Country Status (6)

Country Link
US (1) US5607283A (de)
EP (1) EP0618367B1 (de)
JP (1) JP3228446B2 (de)
KR (1) KR100231142B1 (de)
DE (1) DE69407080T2 (de)
HU (1) HU222960B1 (de)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4341563A1 (de) * 1993-12-07 1995-06-08 Bosch Gmbh Robert Aggregat zum Fördern von Kraftstoff aus einem Vorratstank zur Brennkraftmaschine eines Kraftfahrzeuges
DE4435883A1 (de) * 1994-10-07 1996-04-11 Bosch Gmbh Robert Aggregat zum Fördern von Kraftstoff aus einem Vorratsbehälter zur Brennkraftmaschine eines Kraftfahrzeuges
US6019570A (en) * 1998-01-06 2000-02-01 Walbro Corporation Pressure balanced fuel pump impeller
US6113363A (en) * 1999-02-17 2000-09-05 Walbro Corporation Turbine fuel pump
US6210102B1 (en) 1999-10-08 2001-04-03 Visteon Global Technologies, Inc. Regenerative fuel pump having force-balanced impeller
JP3907887B2 (ja) * 1999-10-28 2007-04-18 株式会社エンプラス 円周流ポンプ用インペラ
US6299406B1 (en) * 2000-03-13 2001-10-09 Ford Global Technologies, Inc. High efficiency and low noise fuel pump impeller
DE10160199B4 (de) * 2001-12-07 2005-08-25 Siemens Ag Laufrad
DE10246694B4 (de) * 2002-10-07 2016-02-11 Continental Automotive Gmbh Seitenkanalpumpe
DE102006055916A1 (de) * 2005-11-28 2007-07-05 Aisan Kogyo K.K., Obu Pumpe
US20070177995A1 (en) * 2006-02-01 2007-08-02 Yoshio Yano Pump device
US20070183908A1 (en) * 2006-02-06 2007-08-09 Yoshio Yano Contactless centrifugal pump
JP4889432B2 (ja) * 2006-10-06 2012-03-07 愛三工業株式会社 燃料ポンプ
KR101007013B1 (ko) * 2008-12-31 2011-01-12 현담산업 주식회사 자동차용 연료펌프에 형성된 펌프부의 마찰저감구조
KR101011366B1 (ko) 2009-01-07 2011-01-28 현담산업 주식회사 자동차용 터빈형 전동기식 연료펌프의 펌프부 구조
CN105782109B (zh) * 2016-03-06 2020-05-12 亿德机电科技（福建）有限公司 一种燃烧机专用泵旋涡叶轮

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Publication number Priority date Publication date Assignee Title
JPS57114195A (en) * 1980-12-31 1982-07-15 Nippon Musical Instruments Mfg Electronic musical instrument
JPS57171092A (en) * 1981-04-13 1982-10-21 Nippon Denso Co Ltd Motor-driven fuel pump
JPS582495A (ja) * 1981-06-29 1983-01-08 Matsushita Electric Ind Co Ltd 渦流ポンプ装置
JPS58197495A (ja) * 1982-05-13 1983-11-17 Nippon Denso Co Ltd ポンプ装置
JPS6085284A (ja) * 1983-10-17 1985-05-14 Taiho Kogyo Co Ltd 回転型オイルポンプ
US4854830A (en) * 1987-05-01 1989-08-08 Aisan Kogyo Kabushiki Kaisha Motor-driven fuel pump
EP0450362B1 (de) * 1990-03-28 1994-03-02 Coltec Industries Inc Seitenkanalpumpe
US5137418A (en) * 1990-12-21 1992-08-11 Roy E. Roth Company Floating self-centering turbine impeller

Also Published As

Publication number Publication date
DE69407080T2 (de) 1998-04-09
HUH3901A (hu) 1999-12-28
US5607283A (en) 1997-03-04
HU222960B1 (hu) 2004-01-28
EP0618367A1 (de) 1994-10-05
JPH06280776A (ja) 1994-10-04
DE69407080D1 (de) 1998-01-15
HU9400696D0 (en) 1994-06-28
JP3228446B2 (ja) 2001-11-12
KR940021938A (ko) 1994-10-19
KR100231142B1 (ko) 1999-11-15

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